CN115381818A - Method for promoting autophagy degradation function of cells and application - Google Patents

Method for promoting autophagy degradation function of cells and application Download PDF

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CN115381818A
CN115381818A CN202210825267.9A CN202210825267A CN115381818A CN 115381818 A CN115381818 A CN 115381818A CN 202210825267 A CN202210825267 A CN 202210825267A CN 115381818 A CN115381818 A CN 115381818A
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pik75
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彭保卫
徐宇虹
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Dali University
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Abstract

The invention belongs to the field of biomedical research, and particularly relates to a method for promoting autophagy degradation function of cells and application of the method. According to the invention, extensive and intensive research shows that the small molecular inhibitor PIK75 can obviously induce autophagy of cells by inhibiting PI3K on endosome/lysosome for the first time. On this basis, a specific autophagy induction method was developed: the small molecule inhibitor PIK75 can inhibit PI3K on an endosome/lysosome, and can obviously induce autophagy of cells. Unlike classical PI3K inhibitors that induce autophagosome production, the present method primarily promotes autophagosome/autophagy substrate degradation and therefore has a wide range of potential therapeutic applications.

Description

Method for promoting autophagy degradation function of cells and application
Technical Field
The invention belongs to the field of biomedical research, and particularly relates to a method for promoting autophagy degradation function of cells and application of the method.
Background
Autophagy functions in multicellular animals to maintain a homeostatic balance of cells and tissues. It transports intracellular components such as large protein aggregates, damaged organelles, etc. into lysosomes for degradation and circulation. Autophagy is closely related to many pathophysiological processes, such as aging, autoimmune diseases, inflammatory diseases, tumors, neurodegenerative diseases, cardiovascular diseases, and the like. For example, age-dependent inhibition of autophagy is considered a common feature of aging. It was found that the longevity-extending effect of rapamycin was strictly dependent on the induction of autophagy.
In Crohn's disease and ulcerative colitis, the mutation of the autophagy gene ATG16L1T300A results in the enzymatic cleavage of the substrate for CASP3, which makes mice more susceptible to intestinal symbiosis or aggravates inflammation caused by Dextran Sodium Sulfate (DSS). In tumorigenesis, autophagy can inhibit tumorigenesis. The autophagy gene Becn (encoding the protein Beclin 1) was investigated for its haplotype dose insufficiency. It appears that Becn +/-mice are more susceptible to spontaneous or oncogene-driven tumors than wild type mice. Various neurodegenerative diseases are associated with accumulation of protein aggregation or high expression of proteins, such as intracellular MAPT/tau protein entanglement and extracellular beta amyloid plaques associated with Alzheimer's disease; high expression of SNCS/alpha-synuclein related to Parkinson disease. Studies suggest that accumulation/high expression of these proteins is a sufficient necessary factor for the generation of toxic driving lesions.
Preclinical data support the development of diseases in which autophagy can be regulated at various stages of atherosclerosis. Specific knockout of Atg5 in macrophages or Atg7 in vascular smooth muscle cells accelerates progression of atherosclerosis in apoe (apolipoprotein E) knockout mice fed western diet. Defects in autophagy promote the onset and progression of the above diseases, suggesting that autophagy activation/induction may have beneficial effects. Autophagy is usually activated in the case of nutritional deficiencies. Some clinically useful drugs such as sirolimus (Rapamycin) enhance autophagic production but do not necessarily promote autophagic degradation. In addition, these compounds have multiple functions. The classical PI3K/Akt has important functions in the aspects of cell growth, proliferation, survival and metabolism. After PI3K/Akt is activated by growth factors on the plasma membrane of cells, mTORC1 is activated, thereby inhibiting autophagy.
However, a specific autophagic degradation inducer/method is an unmet need.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention aims to provide a method for promoting autophagy degradation function and application thereof.
In order to achieve the above objects and other related objects, the present invention adopts the following technical solutions:
in a first aspect of the invention, the use of the small molecule inhibitor PIK75 for the preparation of a medicament for promoting autophagic degradation is provided.
In one embodiment, the autophagic degradation-promoting agent has at least one of the following functions:
promoting autophagosome clearance; promoting autophagic degradation of tumor cells; promoting macrophage autophagic degradation; inhibiting the secretion of inflammatory factors by macrophages; relieving inflammatory reaction of enteritis.
The small molecule inhibitor PIK75 refers to a molecule having a promoting effect on the clearance of autophagosomes.
Specifically, the structural formula of the small molecule inhibitor PIK75 (free base) is as follows:
Figure BDA0003746260370000021
the molecular formula of the PIK75 (free base) is C 16 H 14 BrN 5 O 4 S, molecular weight 452.28. The CAS number for PIK75 (free base) is 372196-67-3. The PIK75 (free base) is designated by the International Union of Pure and Applied Chemistry (IUPAC) as:
(E)-N'-((6-bromoimidazo[1,2-a]pyridin-3-yl)methylene)-N,2-dimethyl-5-nitrobenzenesulfono hydrazide。
the PIK75 (free base) is named as follows: 2-methyl-5-nitrobenzenesulfonic acid [ (6-bromoimidazo [1,2-a ] pyridin-3-yl) methylene ] methylhydrazine.
The structural formula of the small molecule inhibitor PIK75 (hydrochloride) is as follows:
Figure BDA0003746260370000022
the molecular formula of the PIK75 (hydrochloride) is C 16 H 14 BrN 5 O 4 Hci, molecular weight 488.7. The CAS number for PIK75 (free base) is 372196-77-5. The PIK75 (hydrochloride) is designated by the International Union of Pure and Applied Chemistry (IUPAC):
(E)-N'-((6-bromoimidazo[1,2-a]pyridin-3-yl)methylene)-N,2-dimethyl-5-nitrobenzenesulfonohydr azide hydrochloride。
the PIK75 (hydrochloride) has the chinese name: 2-methyl-5-nitrobenzenesulfonic acid [ (6-bromoimidazo [1,2-a ] pyridin-3-yl) methylene ] methylhydrazine hydrochloride.
In the present embodiment, PIK75 (hydrochloride) (formula II) is used as an example.
The autophagy degradation promoting drug necessarily comprises a small molecule inhibitor PIK75, and the small molecule inhibitor PIK75 is used as an effective component of the functions.
In the autophagy degradation promoting drug, the effective component exerting the above functions can be only the small molecule inhibitor PIK75, and other molecules playing similar functions can also be contained.
That is, the small molecule inhibitor PIK75 is the only active ingredient or one of the active ingredients of the autophagic degradation-promoting drug.
The autophagy degradation-promoting drug may be a single-component substance or a multi-component substance.
The form of the autophagic degradation promoting agent is not particularly limited, and may be in the form of various substances such as solid, liquid, gel, semifluid, aerosol, and the like.
The autophagy degradation promoting drug is mainly targeted to mammals such as rodents, primates and the like.
In a second aspect of the invention, a method of promoting autophagic degradation is provided by administering to a subject a small molecule inhibitor PIK75.
The subject may be a mammal or a mammalian cell. The mammal is preferably a rodent, artiodactyla, perissodactyla, lagomorpha, primate, or the like. The primate is preferably a monkey, ape or human. The cell may be an ex vivo cell.
The subject may be a patient suffering from a disease or an individual in whom treatment is desired.
The small molecule inhibitor PIK75 can be administered to a subject before, during, or after receiving treatment.
In a third aspect of the invention, there is provided an autophagy degradation-promoting drug comprising an effective amount of the small molecule inhibitor PIK75.
Further, the autophagy degradation promoting drug comprises an effective dose of a small molecule inhibitor PIK75 and a medicinal carrier.
The autophagy degradation promoting drug necessarily comprises a small molecule inhibitor PIK75, and the small molecule inhibitor PIK75 is used as an effective component of the function.
In the autophagy degradation promoting drug, the effective component exerting the above functions can be only the small molecule inhibitor PIK75, and other molecules playing similar functions can also be contained.
That is, the small molecule inhibitor PIK75 is the only active ingredient or one of the active ingredients of the autophagic degradation-promoting drug.
The autophagy degradation-promoting drug may be a single-component substance or a multi-component substance.
The form of the autophagic degradation promoting agent is not particularly limited, and may be in the form of various substances such as solid, liquid, gel, semifluid, aerosol, and the like.
The small molecule inhibitor PIK75 is used as a main active ingredient or one of the main active ingredients to prepare the medicine. Generally, the medicament may comprise one or more pharmaceutically acceptable carriers or adjuvants in addition to the active ingredient, according to the requirements of different dosage forms. By "pharmaceutically acceptable" it is meant that the molecular entities and compositions do not produce adverse, allergic, or other untoward reactions when properly administered to an animal or human. The "pharmaceutically acceptable carrier or adjuvant" should be compatible with, i.e., capable of being blended with, the small molecule inhibitor PIK75 without substantially reducing the effectiveness of the pharmaceutical composition under normal circumstances. Specific examples of some substances that can serve as pharmaceutically acceptable carriers or adjuvants are sugars, such as lactose, glucose and sucrose; starches, such as corn starch and potato starch; cellulose and its derivatives, such as sodium methylcellulose, ethylcellulose and methylcellulose; powdered gum tragacanth; malt; gelatin; talc; solid lubricants, such as stearic acid and magnesium stearate; calcium sulfate; vegetable oils such as peanut oil, cottonseed oil, sesame oil, olive oil, corn oil and cocoa butter; polyhydric alcohols such as glycerol, glycerin, sorbitol, mannitol, and polyethylene glycol; alginic acid; emulsifiers, such as Tween; wetting agents, such as sodium lauryl sulfate; a colorant; a flavoring agent; tabletting agents, stabilizers; an antioxidant; a preservative; pyrogen-free water; isotonic saline solution; and phosphate buffer, and the like. These materials are used as needed to aid in the stability of the formulation or to aid in the enhancement of the activity or its bioavailability or to produce an acceptable mouthfeel or odor upon oral administration. In the present invention, unless otherwise specified, the pharmaceutical dosage form is not particularly limited, and may be prepared into injection, oral liquid, tablet, capsule, dripping pill, spray, etc., and may be prepared by a conventional method. The choice of the pharmaceutical dosage form should be matched to the mode of administration.
The autophagic degradation promoting drug is mainly targeted to mammals such as rodents, primates and the like.
In a fourth aspect of the invention, a combination therapeutic drug combination is provided comprising an effective amount of the small molecule inhibitor PIK75 and at least one other autophagic degradation-promoting drug.
The combination therapy drug combination may be in any one of the following forms:
firstly), the small molecule inhibitor PIK75 and other autophagy degradation promoting drugs are respectively prepared into independent preparations, the preparation formulations can be the same or different, and the administration routes can be the same or different.
When the other autophagic degradation promoting agent is an antibody, a parenteral administration type is generally employed. When the other autophagic degradation-promoting drugs are chemical drugs, the administration forms can be rich, and the drugs can be administered through the gastrointestinal tract or can be administered through the parenteral tract. Known routes of administration for each chemical are generally recommended.
And secondly), the small molecule inhibitor PIK75 and other autophagy degradation promoting medicines are prepared into a compound preparation, and when the small molecule inhibitor PIK75 and other autophagy degradation promoting medicines are administered by the same administration route and are applied simultaneously, the small molecule inhibitor PIK75 and other autophagy degradation promoting medicines can be prepared into the compound preparation.
The antibody is usually administered by intravenous injection, intravenous drip or arterial infusion. The usage and the dosage can refer to the prior art.
The small molecule compounds are usually administered by either gastrointestinal or parenteral administration. The siRNA, shRNA and antibody are generally administered parenterally. Can be administered locally or systemically.
An effective amount of the small molecule inhibitor PIK75 and an effective amount of at least one other autophagic degradation promoting drug may be administered simultaneously or sequentially.
When in use, the effective amount of the small molecule inhibitor PIK75 and the effective amount of other autophagy degradation promoting drugs can be used simultaneously, or the effective amount of the small molecule inhibitor PIK75 and the effective amount of other autophagy degradation promoting drugs can be used successively. When administered sequentially, the other drug should be administered to the organism during the period that the first drug is still effective for the organism.
In a fifth aspect of the invention, a method of promoting autophagy degradation is provided, comprising administering to a subject an effective amount of the small molecule inhibitor PIK75 and administering to the subject an effective amount of another autophagy degradation-promoting agent and/or administering to the subject another autophagy degradation-promoting means.
An effective amount of the small molecule inhibitor PIK75 and an effective amount of at least one other autophagic degradation promoting drug may be administered simultaneously or sequentially.
The compound can play a role in adding curative effects at least in the combined use with other autophagy degradation promoting medicines except the small molecule inhibitor PIK75, and further enhances the treatment effect.
Other autophagic degradation-promoting agents include, but are not limited to: antibody drugs, chemical drugs or targeted drugs, etc.
The small molecule inhibitor PIK75 may be administered parenterally or parenterally. The other autophagic degradation promoting drug may be administered gastrointestinal or parenteral. For antibody drugs, parenteral administration is generally employed.
In a seventh aspect of the invention, there is provided the use of the small molecule inhibitor PIK75 in the manufacture of a medicament for use as a medicament having any one or more of the following:
promoting autophagosome clearance; promoting autophagy degradation of tumor cells; promoting macrophage autophagic degradation; inhibiting secretion of inflammatory factors by macrophages; relieving inflammatory reaction of enteritis.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, extensive and intensive research shows that the small molecular inhibitor PIK75 can obviously induce autophagy of cells by inhibiting PI3K on endosome/lysosome for the first time. On this basis, a specific autophagy induction method was developed: the small molecule inhibitor PIK75 is used for inhibiting PI3K on an endosome/lysosome, so that autophagy of cells can be remarkably induced. Unlike classical PI3K inhibitors that induce autophagosome production, the present method primarily promotes autophagosome/autophagy substrate degradation and therefore has a wide range of potential therapeutic applications.
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FIG. 1: the small molecule inhibitor PIK75 promotes autophagosome clearance. Wherein FIG. 1A shows that PIK75 promotes autophagosome clearance, MDA-MB-231 breast cancer cells, and after transfection with Ad-mRFP-GFP-LC3, autophagy is induced by serum starvation for 24 hours; cells were treated with 100nM pikk 75 after the last 5-6 hours of serum starvation; autophagosome levels in living cells were observed under a fluorescence microscope (red fluorescence and green fluorescence are double positive). Figure 1B is a quantitative analysis of the autophagosome area of figure 1A, mean ± SD, n =50 cells/sample, P <0.001 by t-test. FIGS. 1C and 1D show that PIK75 promotes lysosome dispersion in cytoplasm, and in MDA-MB-231 breast cancer cells, LAMP2-GFP was overexpressed (FIG. 1C) or immunofluorescent staining was performed with anti-LAMP2 antibody (FIG. 1D), and the distribution of lysosome in cells by PIK75 treatment was examined. Figure 1E is a quantitative analysis of lysosomes from the cells in figure 1D, mean ± SD, n =50 cells/sample, P <0.01 by t-test. FIG. 1F shows that removal of PIK75 inhibits lysosomal reaggregation around the nucleus, MDA-MB-231 breast cancer cells were treated with 100nM PIK75 for 6 hours, PIK75 was removed by changing the medium, lysosomes were labeled with 1 μ M Lysotracker for 1 minute, and lysosomal dynamics in living cells were followed under a fluorescent microscope. FIG. 1G shows that removal of PIK75 inhibition causes autophagosome re-accumulation in cells, MDA-MB-231 breast cancer cells, after transfection of Ad-mRFP-GFP-LC3, were serum starved for 48 hours, with 100nM PIK75 added for 24-30 hours, and autophagosome levels in living cells were observed under a fluorescent microscope. Figure 1H, mean ± SD, n =50 cells/sample, P <0.001 by t-test, for the quantitative analysis of autophagosome area in figure 1A in figure 1G.
FIG. 2: the small molecule inhibitor PIK75 promotes the autophagy degradation function of tumor cells. Figure 2a, pikk 75 promotes autophagic degradation function, MDA-MB-231 cells, serum starved for 16 hours and 100nm pikk 75 added during the last 6 hours cells were harvested and immunoblotted for Akt and its phosphorylation levels, LC3 and p62 levels. FIG. 2B, differential analysis of the effect of PIK75 and Rapamycin on autophagy. MDA-MB-231 cells were serum starved for 16 hours and 100nM PIK75 or 500nM Rapamycin was added over the last 6 hours cells were harvested and immunoblotted for autophagy-related protein expression (LC 3, p 62) and levels of PI3K/Akt/mTORC1 pathway protein activation (Akt and S6K phosphorylation), #1 and #2 samples were two biological replicates.
FIG. 3: the small molecule inhibitor PIK75 can promote the autophagy degradation function of macrophages and inhibit the macrophages from secreting inflammatory factors. FIG. 3A, PIK75 inhibits PI3K/Akt activity in BMDM macrophages both time-dependently (left) and dose-dependently. Figure 3b, pikk75 promotes p62 degradation in BMDM macrophages; LPS stimulated BMDM macrophages for 6 hours or none while cells were treated with 100nM pikk 75; cells were collected and analyzed by immunoblot for autophagy-related protein expression (LC 3, p 62); * Non-specific bands. FIG. 3C, cell treatment as in FIG. 3B, LPS and PIK75 for 2 hours or 4 hours, respectively; cell supernatants were collected and assayed for TNF-a levels by ELISA. FIG. 3D, PIK75 induces apoptosis of BMDM macrophages; LPS stimulated BMDM macrophages while treating the cells with 100nM pikk 75 for 3 hours or overnight, or 500nM Rapamycin treated cells overnight; collecting cells, and analyzing PI3K/Akt/mTORC1 protein phosphorylation and apoptosis Caspase-3 activity by immunoblotting, wherein an activation band of Caspase-3 is 15kDa.
FIG. 4: the small molecule inhibition of PIK75 may alleviate DSS-induced enteritis. FIG. 4A, the change in body weight of mice in 2.5% DSS drinking water induced enteritis, control group and PIK75 drug group. FIG. 4B, mice induced enteritis, colon tissue sections in 2.5% DSS drinking water; the control group had severe inflammation, thickened intestinal wall and disappeared crypt; the PIK75 administration group had relatively mild inflammation and had relatively intact crypts.
Detailed Description
Before the present embodiments are further described, it is to be understood that the scope of the invention is not limited to the particular embodiments described below; it is also to be understood that the terminology used in the examples is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the present invention. Test methods in which specific conditions are not specified in the following examples are generally carried out under conventional conditions or under conditions recommended by the respective manufacturers.
When numerical ranges are given in the examples, it is understood that both endpoints of each of the numerical ranges and any number between the two endpoints are optional unless otherwise specified in the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In addition to the specific methods, devices, and materials used in the examples, any methods, devices, and materials similar or equivalent to those described in the examples may be used in the practice of the invention in addition to the specific methods, devices, and materials used in the examples, in keeping with the knowledge of one skilled in the art and with the description of the invention.
Unless otherwise indicated, the experimental methods, detection methods, and preparation methods disclosed herein all employ techniques conventional in the art of molecular biology, biochemistry, chromatin structure and analysis, analytical chemistry, cell culture, recombinant DNA technology, and related arts. These techniques are well described in the literature, and may be found in particular in the study of the MOLECULAR CLONING, sambrook et al: a LABORATORY MANUAL, second edition, cold Spring Harbor LABORATORY Press,1989and Third edition,2001; ausubel et al, current PROTOCOLS IN MOLECULAR BIOLOGY, john Wiley & Sons, new York,1987and periodic updates; the series METHODS IN ENZYMOLOGY, academic Press, san Diego; wolffe, CHROMATIN STRUCTURE AND FUNCTION, third edition, academic Press, san Diego,1998; METHOD IN ENZYMOLOGY, vol.304, chromatin (P.M. Wassarman and A.P. Wolffe, eds.), academic Press, san Diego,1999; and METHODS IN MOLECULAR BIOLOGY, vol.119, chromatography Protocols (P.B.Becker, ed.) Humana Press, totowa,1999, etc.
Example 1 Small molecule inhibitor PIK75 promotes autophagosome clearance
1.1, purpose of the test
The function of the small molecule inhibitor PIK75 to promote clearance from the phagosome was examined.
1.2 test methods and conclusions
(1) Cell culture
Breast cancer cell line MDA-MB-231, 1% by weight of 10% FBS in DMEM, P/S at 5% CO 2 And culturing at 37 ℃ in an incubator with 90% humidity. Mouse BMDM cells were induced from mouse bone marrow cells. Specifically, the mouse bone marrow cells were obtained by flushing the femur and tibia of the thigh of the mouse. Resuspending mouse bone marrow cells in alpha-MEM +10% FBS +1% P/S medium at 1x10 6 The cells were plated at a concentration of 10ng/mL M-CSF,10ng/mL IL-4, and 10ng/mL IL-13 in 6-cm dishes for 6 days, with a change on the third day.
(2) Immunofluorescence
To investigate autophagy of cells using Ad-mRFP-GFP-LC3 viral transfection, cells were plated at 1X10 5 Per mL/well in 24-well plates. The next day, change to noneSerum medium, ad-mRFP-GFP-LC3 virus transfection more than 6 hours, change to complete medium culture 24 hours to make mRFP-GFP-LC3 fully expressed. Serum starvation was about 16 hours. Cells were treated with 100nM PIK75 during the last 5-6 hours of serum starvation. Clearance of autophagosomes under various treatment conditions was observed by fluorescence microscopy.
(3) Small molecule inhibitor PIK75 promotes autophagosome clearance
MDA-MB-231 breast cancer cells are subjected to serum starvation for 16 hours, and a large amount of autophagosomes are generated in the cells, which is shown in that a large amount of tandem red fluorescent protein and green fluorescent double-positive LC3 vesicles exist in adenovirus Ad-mRFP-GFP-LC3 transfected cells (figure 1A, figure 1B); when cells were treated with 100nM pikk75 for 5 hours while serum starvation, intracellular autophagosomes were significantly reduced (fig. 1a, 1b). In cells expressing LAMP-2-GFP, serum starvation leads to accumulation of lysosomes around the nucleus; when cells were treated with 100nM pikk75 for 5 hours while serum starved, lysosomes were seen to disperse in the cytoplasm (fig. 1C). Similarly, immunofluorescence staining showed that PIK75 treated cells, promoted lysosomal dissemination into the cytoplasm (fig. 1D, fig. 1E). Lysosomes, when dispersed in the cytoplasm, fuse more readily with autophagosomes formed in the cytoplasm to form autophagosomes, thereby accelerating clearance of autophagic substrates. In addition, if PIK75 was removed by medium exchange, time-dependent aggregation of lysosomes labeled with Lysotracker to the perinuclear nuclei could be observed under a fluorescence microscope (fig. 1F). At the same time, removal of PIK75 resulted in the re-accumulation of autophagosomes in the cells (fig. 1G, fig. 1H).
Example 2 Small molecule inhibitor PIK75 promotes tumor cell autophagy degradation function
2.1, purpose of the test
And (3) observing the autophagy degradation function of the small molecule inhibitor PIK75 on tumor cells.
2.2 test methods and conclusions
(1) Cell culture
The procedure is as in example 1.
(2) Immunoblotting
Tumor cells or BMDM cells induced to mature were plated in 6-well plates. For tumor cells, the next day serum starvation was about 16 hours. Cells were treated with 100nM PIK75 during the last 5-6 hours of serum starvation. For BMDM cells, the next day the cells were stimulated with 100 ng/. Mu.L LPS, and simultaneously with the addition of 100nM PIK75 the cells were harvested and lysed. The cell lysate supernatant was collected and the protein concentration was determined. The cell protein is separated by SDS-PAGE, and the expression of the autophagy-related protein is detected by immunoblotting. Primary antibody and dilution factor are: rabbitit-anti-p 62 (1) (Novus bio.), (1: HRP-conjugated-coat-anti-rabbit-IgG (H + L) (1 + 10000) (Thermo.) immunoblots were developed by ECL.
(3) Small molecule inhibitor PIK75 promotes autophagy degradation of tumor cells
MDA-MB-231 breast cancer cells, after serum starvation for 16 hours, were subjected to immunoblotting to show increased LC3-II protein expression in the cells, indicating increased autophagosome synthesis (fig. 2A). When cells were treated with 100nM pikk75 for 5 hours while starving with serum, akt phosphorylation levels in the cells were reduced and LC3-II protein expression was significantly reduced, along with a significant reduction in autophagy substrate p62, indicating that PIK75 promoted clearance of autophagosomes and substrates (fig. 2A). Rapamycin promotes increased autophagosome synthesis by inhibiting mTORC1 activity (as demonstrated by decreased phosphorylation of S6K) as demonstrated by a significant increase in LC3-II protein expression levels in the cells (fig. 2B). However, rapamycin had no effect on the clearance of the autophagy substrate p62 (FIG. 2B). The above results indicate that PIK75 promotes autophagy degradation function, not by inhibiting the classical PI3K/Akt/mTORC1 pathway.
Example 3 Small molecule inhibitor PIK75 promotes the autophagy degradation function of macrophages, inhibits the secretion of inflammatory factors from macrophages
3.1, purpose of the test
And (3) inspecting the functions of the small molecule inhibitor PIK75 for promoting the autophagy degradation of the macrophages and inhibiting the secretion of inflammatory factors by the macrophages.
3.2 test methods and conclusions
(1) Cell culture
The procedure is as in example 1.
(2) Immunoblotting
The procedure is as in example 2.
(3) Small molecule inhibitor PIK75 can promote macrophage autophagy degradation function and inhibit macrophage from secreting inflammatory factor
PIK75 inhibited PI3K/Akt activity in BMDM macrophages, as evidenced by decreased levels of Akt phosphorylation, and was dependent on time of action (fig. 3A, left panel) and dose of action (fig. 3A, right panel). PIK75 promoted the degradation of the autophagy substrate p62 protein in macrophages (fig. 3B). Upon stimulation with inflammatory signals (e.g. LPS stimulation), p62 accumulates in large amounts in macrophages (fig. 3B). PIK75 was able to reduce p62 protein levels in macrophages stimulated by inflammatory signals very significantly (fig. 3B). p62 accumulation may activate the expression of inflammatory factors through the NF-kB signaling pathway. After the macrophage secreted TNF-a level after LPS stimulation was measured by ELISA, PIK75 was found to significantly inhibit the macrophage from secreting TNF-a, and the TNF-a level was positively correlated with the p62 protein level (FIG. 3C). In addition, PIK75 promoted macrophage apoptosis, whereas Rapamycin did not (fig. 3C). Therefore, the small molecule inhibitor PIK75 can promote the autophagy degradation function of macrophages and inhibit the macrophages from secreting inflammatory factors.
Example 4 Small molecule inhibitor PIK75 alleviates DSS-induced enteritis
4.1, purpose of the test
The small molecule inhibitor PIK75 is examined to reduce the function of DSS-induced enteritis.
4.2 test methods and conclusions
(1) Cell culture
The procedure is as in example 1.
(2) Model of UC enteritis induced by DSS (dextran sulfate sodium)
DSS has intestinal epithelial cytotoxicity, causing mucosal injury, and intestinal antigens (microorganisms, etc.) contact DCs and Macrophages, activating the immune system, causing inflammatory reactions. Female SPF-grade C57BL/6 mice were randomly selected, weighed 20. + -.2 g, and acclimatized in IVC system (20-25 ℃,50-60% RH). An acute UC model is established by referring to a Cooper HS and other methods: c57BL/6 mice freely drink 2.5% DSS aqueous solution for 5 days, with fresh DSS solution replaced daily, establishing mouse acute UC model. After 5 daysThe water is changed into normal drinking water. Normal control mice were treated with drinking distilled water. The drug dose of PIK75 was 2mg/kg mouse body weight. PIK75 dissolution and 10% DMSO 30% PEG400, 20% Tween80, 40% ddH 2 And O, performing intragastric administration on day 2 of UC enteritis induced by DSS, wherein the administration is performed at a dose of 100 mu L/day for 5 consecutive days. The weight change, diarrhea and hematochezia symptoms of the mice are regularly detected every day. The control group was intragastrically infused with solvent. Colon tissue was pathologically sectioned after mice sacrificed on day 8. To examine the change in body weight of the mice, the mice were sacrificed on day 11.
(3) Small molecule inhibition of PIK75 can alleviate DSS-induced enteritis
DSS has intestinal epithelial cytotoxicity, causing mucosal injury, and intestinal antigens (microorganisms, etc.) contact DCs and macrophages, activating the immune system, causing inflammatory reactions. Mice began to lose weight 5 days after being fed 2.5% dss aqueous solution, regardless of whether they were treated with PIK75 or not (fig. 4A). However, the body weight loss of the PIK75 treated group was significantly slower than that of the control group (fig. 4A). In addition, PIK75 treated groups had minor diarrhea, hematochezia, etc. The colon tissue section result shows that intestinal ulcer, inflammatory cell infiltration and crypt disappearance of a control group are realized; whereas the PIK75 treated group had less inflammatory cell infiltration and the crypts were relatively intact (fig. 4B). The above results indicate that PIK75 can alleviate DSS-induced enteritis. Based on the role of PIK75 in macrophage autophagy degradation, it is speculated that PIK75 plays a role in alleviating UC by promoting UC-infiltrating inflammatory cells DCs and macrophage autophagy degradation.
While the invention has been described with respect to a preferred embodiment, it will be understood by those skilled in the art that the foregoing and other changes, omissions and deviations in the form and detail thereof may be made without departing from the scope of this invention. Those skilled in the art can make various changes, modifications and equivalent arrangements, which are equivalent to the embodiments of the present invention, without departing from the spirit and scope of the present invention, and which may be made by utilizing the techniques disclosed above; meanwhile, any equivalent changes, modifications and evolutions of the above embodiments according to the essential technology of the present invention are still within the scope of the technical solution of the present invention.

Claims (10)

1. Use of a small molecule inhibitor PIK75 for the preparation of a medicament for promoting autophagic degradation of a cell.
2. The use of claim 1, wherein said autophagic degradation-promoting agent serves at least one of the following functions: promoting autophagosome clearance; promoting autophagy degradation of tumor cells; promoting autophagic degradation of macrophages; inhibiting secretion of inflammatory factors by macrophages; relieving inflammatory reaction of enteritis.
3. The use according to claim 1, wherein the small molecule inhibitor PIK75 is a molecule having a promoting effect on autophagosome clearance.
4. The use according to claim 1, wherein the small molecule inhibitor PIK75 promotes autophagosome/autophagy substrate degradation.
5. The use according to claim 1, wherein the small molecule inhibitor PIK75 is the only active ingredient or one of the active ingredients of the autophagic degradation-promoting drug.
6. An autophagy degradation promoting drug comprising an effective amount of the small molecule inhibitor PIK75.
7. An autophagic degradation-promoting pharmaceutical composition comprising an effective amount of the small molecule inhibitor PIK75 and at least one other autophagic degradation-promoting drug.
8. Use of the small molecule inhibitor PIK75 in the manufacture of a medicament having any one or more of the following: promoting autophagosome clearance; promoting autophagy degradation of tumor cells; promoting macrophage autophagic degradation; inhibiting the secretion of inflammatory factors by macrophages; relieving inflammatory reaction of enteritis.
9. A method for promoting autophagic degradation comprises administering a small molecule inhibitor PIK75 to a subject.
10. A method for promoting autophagy degradation comprises the steps of administering an effective amount of a small molecule inhibitor PIK75 to a subject and administering an effective amount of other autophagy degradation promoting drugs to the subject and/or implementing other autophagy degradation promoting means to the subject.
CN202210825267.9A 2022-07-14 2022-07-14 Method for promoting autophagy degradation function of cells and application Pending CN115381818A (en)

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